The National Weather Service forecasts partly sunny skies here in Cobb County on Friday, September 15, 2023, with a high near 78 degrees.

The National Weather Service has also issued a hazardous weather outlook for Cobb County and other parts of the region due to scattered thunderstorms that will be more focused across west and central Georgia by this afternoon.

What does the extended forecast have in store?

This forecast is centered on Dobbins Air Reserve Base in Marietta.

Today

A chance of showers and thunderstorms before 11 a.m, then a chance of showers between 11 a.m and 1 p.m, then a chance of showers and thunderstorms after 1 p.m. Partly sunny, with a high near 78. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 40 percent.

Tonight

A slight chance of showers and thunderstorms before 9 p.m, then a slight chance of showers after 5 a.m. Partly cloudy, with a low around 64. East wind around 5 mph. Chance of precipitation is 20 percent.

Saturday

A 40 percent chance of showers and thunderstorms, mainly after 9 a.m. Partly sunny, with a high near 75. East wind 5 to 10 mph, with gusts as high as 15 mph.

Saturday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind around 5 mph.

Sunday

A chance of showers and thunderstorms before 9 a.m, then a chance of showers between 9 a.m and 3 p.m, then a chance of showers and thunderstorms after 3 p.m. Partly sunny, with a high near 79. Light and variable wind becoming northwest 5 to 10 mph in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 40 percent.

Sunday Night

A 40 percent chance of showers and thunderstorms before 9 p.m. Mostly clear, with a low around 59.

Monday

Sunny, with a high near 80.

Monday Night

Mostly clear, with a low around 56.

Tuesday

Sunny, with a high near 81.

Tuesday Night

Partly cloudy, with a low around 59.

Wednesday

Mostly sunny, with a high near 80.

Wednesday Night

Partly cloudy, with a low around 61.

Thursday

Mostly sunny, with a high near 79.

What was the climate like in the latest reporting period?

The NWS climate summary for metro Atlanta has now been updated with August 2023 figures.

In an article entitled What is the Difference between Climate and Weather?, the National Ocean Service describes the difference as follows:

“Weather is what you see outside on any particular day. So, for example, it may be 75° degrees and sunny or it could be 20° degrees with heavy snow. That’s the weather.

“Climate is the average of that weather. For example, you can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July. This is climate. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall. If you’ve ever heard your local weather person say “today we hit a record high for this day,” she is talking about climate records.

“So when we are talking about climate change, we are talking about changes in long-term averages of daily weather. In most places, weather can change from minute-to-minute, hour-to-hour, day-to-day, and season-to-season. Climate, however, is the average of weather over time and space.”

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The climate report for the Atlanta area for the previous month shows how much departure from the average temperatures that month represents. The average temperature for a date is the average over a 30-year period.

Date	Max Temp	Min Temp	Average	Depature from norm	Precipitation
2023-08-01	96	73	84.5	3.3	0
2023-08-02	91	74	82.5	1.4	0
2023-08-03	92	73	82.5	1.4	0.23
2023-08-04	91	73	82	0.9	T
2023-08-05	96	74	85	4	0
2023-08-06	96	71	83.5	2.5	1.07
2023-08-07	93	71	82	1.1	0.26
2023-08-08	88	72	80	-0.9	T
2023-08-09	89	69	79	-1.8	0.03
2023-08-10	87	69	78	-2.8	0.16
2023-08-11	90	72	81	0.3	0.65
2023-08-12	94	73	83.5	2.9	0.82
2023-08-13	94	72	83	2.4	0
2023-08-14	96	76	86	5.5	0.01
2023-08-15	90	73	81.5	1.1	0.63
2023-08-16	86	67	76.5	-3.8	0
2023-08-17	87	68	77.5	-2.7	0
2023-08-18	90	69	79.5	-0.7	0
2023-08-19	89	74	81.5	1.4	0
2023-08-20	92	72	82	2	0
2023-08-21	96	75	85.5	5.7	0
2023-08-22	96	76	86	6.3	0
2023-08-23	93	81	87	7.4	0
2023-08-24	96	76	86	6.5	0
2023-08-25	98	80	89	9.6	0
2023-08-26	99	77	88	8.8	0
2023-08-27	97	77	87	7.9	T
2023-08-28	93	73	83	4	0.84
2023-08-29	90	73	81.5	2.7	0.08
2023-08-30	85	71	78	-0.7	0.46
2023-08-31	88	68	78	-0.5	0

Climate Almanac for metro Atlanta

This almanac provides information on past climate conditions for today’s date, September 15, allowing a comparison to current weather. Simply put, it helps you see what the weather would typically be like on this day according to historical data.

Daily Data	Observed	Normal	Record Highest	Record Lowest
Max Temperature	M	84	97 in 1991	61 in 1913
Min Temperature	M	66	76 in 1991	50 in 1892
Avg Temperature	M	75.3	86.5 in 1991	58.0 in 1913
Precipitation	M	0.12	3.00 in 1888	0.00 in 2022
Snowfall	M	0.0	0.0 in 2022	0.0 in 2022
Snow Depth	M	–	0 in 2022	0 in 2022
HDD (base 65)	M	0	7 in 1913	0 in 2022
CDD (base 65)	M	1	22 in 1991	0 in 1985
Month-to-Date Summary	Observed	Normal	Record Highest	Record Lowest
Avg Max Temperature	88.0	85.8	95.9 in 1925	74.9 in 1967
Avg Min Temperature	70.1	68.0	74.6 in 1925	59.6 in 1968
Avg Temperature	79.0	76.9	85.2 in 1925	67.3 in 1967
Total Precipitation	0.28	1.90	10.37 in 1888	0.00 in 1897
Total Snowfall	0.0	0.0	0.0 in 2023	0.0 in 2023
Max Snow Depth	0	–	0 in 2023	0 in 2023
Total HDD (base 65)	0	0	16 in 1902	0 in 2023
Total CDD (base 65)	199	18	307 in 1925	45 in 1967
Year-to-Date Summary	Observed	Normal	Record Highest	Record Lowest
Avg Max Temperature	77.9	75.7	78.3 in 2012	69.9 in 1885
Avg Min Temperature	59.3	56.5	59.3 in 2023	50.7 in 1940
Avg Temperature	68.6	66.1	68.7 in 2012	61.1 in 1940
Total Precipitation	32.56	36.68	55.58 in 1920	21.81 in 1931
Total Snowfall (since July 1)	0.0	0.0	T in 2001	0.0 in 2023
Max Snow Depth (since July 1)	0	–	T in 1942	0 in 2023
Total HDD (since July 1)	0	0	16 in 1902	0 in 2023
Total CDD (since Jan 1)	1983	183	2239 in 2019	1091 in 1967

Period of Record:

• Max Temperature : 1878-10-04 to 2023-09-14
• Min Temperature : 1878-10-04 to 2023-09-14
• Precipitation : 1878-10-01 to 2023-09-14
• Snowfall : 1928-12-25 to 2023-09-14
• Snow Depth : 1928-12-25 to 2023-09-11

For much more information on the climate in our area, visit the NWS Climate FAQ for the Atlanta area.

What does the National Weather Service do?

The National Weather Service (NWS) is a part of the National Oceanic and Atmospheric Administration (NOAA).

The NWS describes its role as follows:

“The National Weather Service (NWS) provides weather, water, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy. 

“These services include Forecasts and Observations, Warnings, Impact-based Decision Support Services, and Education in an effort to build a Weather-Ready Nation. The ultimate goal is to have a society that is prepared for and responds to weather, water and climate events.”